81196315056 has 40 divisors (see below), whose sum is σ = 233063498160. Its totient is φ = 27065438208.

The previous prime is 81196315021. The next prime is 81196315063. The reversal of 81196315056 is 65051369118.

81196315056 is a `hidden beast` number, since 8 + 1 + 1 + 9 + 631 + 5 + 0 + 5 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93976785 + ... + 93977648.

It is an arithmetic number, because the mean of its divisors is an integer number (5826587454).

Almost surely, 2^81196315056 is an apocalyptic number.

It is an amenable number.

81196315056 is an abundant number, since it is smaller than the sum of its proper divisors (151867183104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81196315056 is a wasteful number, since it uses less digits than its factorization.

81196315056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187954450 (or 187954438 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 45.

The spelling of 81196315056 in words is "eighty-one billion, one hundred ninety-six million, three hundred fifteen thousand, fifty-six".